FR2908632A1 - Cosmetic composition, useful for make-up of keratinous matter, comprises multilayer interference pigment, coloring agent, reflective pigment and diffractive pigment - Google Patents

Abstract

Cosmetic composition comprising a multilayer interference pigment, a coloring agent sensitive to an external stimulus, a reflective pigment and a diffractive pigment, where the coverage of the composition is >= 25, preferably 30, and the multilayer interference pigment being in a content conferring to the composition a color deviation (delta E) of >= 5 between the color in the mass and color after application, in a medium. Independent claims are included for: (1) a non-powder cosmetic composition comprising 7-20 wt.% of multi-layer interference pigments, 0.1-10 wt.% of coloring agent sensitive to at least one exterior stimulus, reflective pigment or diffractive pigment, in a medium; (2) a powder cosmetic composition comprising 40-95 wt.% of the multilayer pigment, 0.1-60 wt.% of coloring agent sensitive to at least one exterior stimulus, reflective pigment or diffractive pigment, in a medium; and (3) a set of packaging comprising the composition and a user manual on the color composition after application on the keratin materials.

Description

The present invention relates to a cosmetic solid product intended for

  make-up of the skin, lips or hair. BACKGROUND It is known to introduce diffusing pigments into makeup compositions to produce colors by a phenomenon of absorption of light by specific chromophores. To these diffusing pigments, which are necessary to benefit from a continuous and sufficiently covering colored background, may be added effect particles (s) to create, for example, points of gloss or impart a pearlescent appearance. However, the intensity of the color produced by these compositions may be insufficient to lead to a completely satisfactory result. Multilayer interference pigments, comprising a stack of layers whose refractive indices and thicknesses are suitably selected to generate a color by an interference phenomenon, make it possible to produce a greater color intensity than the diffusing pigments above. . To the knowledge of the inventor, in commercially available compositions, with the exception of powders, these multilayer interference pigments are employed at a mass concentration not exceeding 5%. It is moreover known by CHRYSALIDE brand eyeshadows from LANCAME to confer both coverage and color intensity by means of a make-up involving a first act of depositing on the keratin materials a base layer of black color containing a diffusing pigment providing coverage and then depositing by a second gesture on this base layer a composition providing color through a multilayer interference pigment. Without the base layer, the covering layer is almost invisible because it is not covering and without color. The use of two successive applications complicates makeup and makes packaging more expensive. SUMMARY There is a need to benefit from compositions capable of providing coverage and of producing one or more relatively saturated colors, in order to be able to obtain in a single gesture a makeup that is both covering and colored. Furthermore, it is desirable to benefit from cosmetic compositions intended for the makeup of keratin materials which present new effects that are likely to attract consumers, without these new effects occurring to the detriment of the quality of the makeup obtained. The invention aims in particular to meet all or part of the needs identified above. The subject of the invention is, according to one of its aspects, a solid product, comprising at least: a first block of a first cosmetic composition containing, in a cosmetically acceptable medium, at least one first multilayer interference pigment, a second block of a second cosmetic composition, containing in a cosmetically acceptable medium at least a second multilayer interference pigment different from the first, at least one of the first and second compositions being capable of presenting a first color in the mass and a second color after application, the first and second colors differing by a difference AE greater than or equal to 2, better 5. The color after application is determined for the purposes of calculating AE after spreading the composition on a contrast card, such as for measuring coverage. Each of the first and second compositions may be capable of having a first color in the mass and a second color, after application to keratin materials, the first and second colors of each composition differing by a difference AE of greater than or equal to 5. The first and second blocks may extend the full length of a stick (sometimes called grape or stick) or the entire thickness of the product when it is poured or compacted in a cup. The first and second blocks may be concentric or otherwise arranged. According to the compositions, the difference AE may be between, for example, 5 and 30. The coverage of one of the compositions may be greater than 25, for example between 30 and 70. The coverage of each composition may be greater or 25, preferably 30. Preferably, the coverage of each composition is substantially the same. The coverage of the melted product then spread with mixing of the compositions of the different blocks may be greater than or equal to 25, for example between 30 and 70. In the multilayer interference pigments, the production of the color by the interference phenomenon is in competition with the production of color by the phenomenon of absorption by the surface layer of the pigment. Thus, when the pigment concentration increases sufficiently, the color produced by the interference phenomenon decreases in favor of that produced by absorption.

  The invention, by exploiting this property, makes it possible to observe a color variation of at least one of the compositions on application, which confers a playful aspect to the use. The invention also offers new possibilities in the marketing of cosmetic compositions, allowing to play at the packaging level on this color variation before and after application. The invention offers a way to surprise the consumer by providing the possibility of revealing several colors to the application, in some cases. The mass content of multilayer interference pigment in at least one of the compositions can range from 7 to 20%, more preferably 8 to 15%. The color of at least one of the compositions in the mass may be white. All the blocks can be white, that is to say achromatic in the sense of the CIE, with a whiteness index greater than or equal to 40 for example. At least one of the compositions may have no other coloring agent than the multilayer interference pigment or pigments. This may be the case for all the compositions of the product. The multilayer interference pigment may comprise at least four layers, for example. The multilayer interference pigment may comprise a substrate made of a more or less rough material, which may make it possible to impart more or less gloss to the composition. The substrate is for example selected from natural, relatively rough mica, synthetic mica, alumina, silica or glass or metal for a smoother surface. The compositions of the product may comprise two respective multilayer interference pigments having layers consisting of the same materials. At least one layer of a pigment of one of the compositions may have a different thickness than a corresponding layer of a pigment of the other composition, so as to produce different colors. According to another of its aspects, the subject of the invention is also a packaging unit comprising: a product as defined above; means for informing the user about the color of at least one of compositions of the product after application, or even a color formed by the superposition of the compositions on application. It may be for example an ink or varnish printing, a thin layer of composition or a molding or overmolding of a material incorporating the multilayer interference or pigments.

  Solid product For the purposes of the present invention, the term "solid product" is intended to include a product having the property of being devoid of the ability to flow under the action of its own weight, under normal storage conditions. A solid product may be a product whose viscosity is not measurable.

  The solid product may, if necessary, have a pasty appearance at room temperature (25 C).  At least one of the blocks may have a melting point or a thermal transition temperature (for example a softening point) greater than 25 ° C., in particular ranging from 25 to 85 ° C., or even from 30 ° to 60 ° C., and in particular from 30 to 45 C.  The hardness of at least one of the blocks of composition may vary for example from 0.001 to 0.5 MPa, in particular from 0.005 to 0.4 MPa.  The hardness of a block can be determined by measuring the compressive strength at 20 C using the texturometer sold under the name TA-XT2i by the company RHEO, equipped with a stainless steel cylinder of a 2 mm diameter moving at the measuring speed of 0.1 mm / s, and penetrating into the composition of this block at a penetration depth of 0.3 mm.  The hardness value is the maximum measured compressive force divided by the surface of the texturometer roll in contact with the composition.  In the particular case of lipsticks, the hardness can also be measured by the so-called butter cutter method, which consists in cutting a lipstick stick of 8.1 mm in diameter and measuring the hardness to 20 C, using a DFGHS 2 dynamometer from the company Indelco-Chatillon moving at a speed of 100 mm / minute.  The hardness measured is expressed as the shear force (expressed in gramforce) required to cut the stick under these conditions.  According to this method, the hardness of a solid product according to the invention ranges, for example, from 50 to 300 g, for example from 100 to 250 g and for example from 120 to 230 g.  Measurement of the Coverage of a Composition Block a) For the compacted powdery solid compositions, the composition is applied to matt black and matt white contrast cards, for example LENETA Form WP1 for the matte black card and Leneta lA for the matt white card, covered with a transparent tape, slightly rough, for example brand BLENDERM 3M company and reference 15025, glued by the adhesive side on the contrast cards.  The composition is deposited on the adhesive tape so as to obtain a homogeneous deposition of 0.5 mg / cm 2 0.02 mg / cm 2.  It is possible to use for depositing a sponge loaded with the composition and mounted on a disintegrating device that makes predefined movements with the sponge.  The sponge is for example a disposable sponge of LANCAME Photogenic type, used on the pink side.  b) For a solid non-pulverulent composition, in particular as a stick, the latter is melted, for example at 90 ° C., then spread in the liquid state at a thickness of 50 m on matt white and matt white contrast cards. , for example of the same references as above, not covered with BLENDERM.  The spreading bar is maintained at the same temperature as the composition, so as to avoid thermal shock.  Measurements and Calculations Reflectance spectra are acquired using a MINOLTA 3700-d spectrocolorimeter (diffuse measurement geometry / 8 and observation D65 / 10, specular component excluded mode, small aperture (CREISS)) on black backgrounds and white, the contrast cards being optionally covered with BLENDERM as indicated above.  The spectra are expressed in colorimetric coordinates in the space CIELab76 within the meaning of the International Commission on Illumination according to Recommendation 15: 2004.  The contrast ratio, or coverage, is calculated by averaging Y on a black background, divided by the average value of Y on a white background, multiplied by 100.  Measurement of Product Coverage The product compositions are melted and blended, then the coverage is measured as above for a single composition.  Measuring the color of a composition of the product in the mass The color in the mass is measured after filling a container having a depth sufficiently large to be able to consider an infinite product thickness in view of the measurement, for example a depth of 3 mm or more.  The L *, a * and b * coordinates are measured with a spectrocolorimeter, for example of the MINOLTA CM-2002 mark (D65 / 10, excluding specular component mode).  Measurement of the color of a composition of the product after application The deposition is carried out as for the measurement of the coverage of a composition, except that the thickness of the deposit is 150 m instead of 50 m for the compositions powdery, especially in stick.  The color is measured on the dark background of the contrast card, optionally covered with a transparent adhesive tape in the case of a solid compacted powdery composition, as indicated above.  The difference AE is calculated as follows: 2 2 a * in the mass after appllcation + k * in the mass -1) after application + in the mass -1 'after application Measuring the whiteness index The whiteness index is calculated from the infinite-thickness color measurements and ASTM E313-05.  Multilayer interference peel The term "multilayer interference pigment" denotes a pigment capable of producing a color by a phenomenon of interference between the light rays reflected by a plurality of superimposed layers of different refractive indices, in particular a succession of layers of high and low refractive indices.  All multilayer interference pigments can be envisaged.  The color produced by the multilayer interference pigment may be arbitrary, for example being of dominant wavelength between 580 and 650 nm or not.  The composition may comprise a single multilayer interference pigment or several multilayer interference pigments having different dominant wavelengths.  The multi-layer interference pigment may comprise a substrate (also called a core or core) coated on at least one side with one or more layers of selected materials and thicknesses such that a color is produced by interference.  Layers of the interference pigment may or may not surround the substrate, which may have a flattened shape or not.  The substrate may comprise natural mica, synthetic mica, glass, alumina, silica, or any metal, alloy or metal oxide.  The nature of the substrate may be chosen according to the desired gloss.  For example, for a very bright rendering, a substrate of glass or metal may be preferred.  The interferential pigment may comprise more than four different refractive index layers.  The particle size of the multilayer interference pigment, given by the average particle size at half of the population, also called D50, is, for example, from 1 μm to 2000 μm, better still from 5 μm to 2000 μm.  The proportion of multilayer interference pigment is, for example, greater than 7% and ranges, for example, from 7 to 20% for a non-pulverulent, liquid or cast composition, for example in a stick and from 40 to 95% for a powdery, free or compacted composition. .  The coverage of the composition may be mainly due to the multilayer interference pigment content.  Alternatively, at least one diffusing pigment and / or fillers can provide coverage.  Nacres are examples of multilayer interference pigments that may be suitable.  Nacres By nacre, it is necessary to include colored particles of any shape, iridescent or not, in particular produced by certain shellfish in their shell or else synthesized and which exhibit a color effect by optical interference.  Examples of pearlescent agents include pearlescent pigments such as titanium mica coated with an iron oxide, mica coated with bismuth oxychloride, titanium mica coated with chromium oxide, titanium mica coated with an organic dye in particular as well as pearlescent pigments based on bismuth oxychloride.  It may also be mica particles on the surface of which are superimposed at least two successive layers of metal oxides and / or organic dyestuffs.  The nacres may have a yellow, pink, red, bronze, orange, brown, gold and / or copper color or reflection.  As an illustration of nacres that can be introduced as a multilayer interference pigment, mention may be made of gold-colored pearlescent agents marketed by the company Engelhard under the name Brillant gold 212G (Timica), Gold 222C (Cloisonne), Sparkle gold (Timica), Gold 4504 (Chromalite) and Monarch gold 233X (Cloisonne); bronze nacres sold especially by the company MERCK under the names Bronze Fine (17384) (Colorona) and Bronze (17353) (Colorona) and by Engelhard under the name Super Bronze (Cloisonne); orange nacres sold especially by ENGELHARD under the name Orange 363C (Cloisonne) and Orange MCR 101 (Cosmica) and by MERCK under the name Passion orange (Colorona) and Matte orange (17449) (Microna); brown-colored pearlescent agents marketed by Engelhard under the name Nu-antique copper 340XB (Cloisonne) and Brown CL4509 (Chromalite); nacres with a copper sheen sold especially by Engelhard under the name Copper 340A (Timica); nacres with a red reflection 10, especially those marketed by MERCK under the name Sienna fine (17386) (Colorona); yellow-colored pearlescent agents marketed by ENGELHARD under the name Yellow (4502) (Chromalite); the red-colored pearlescent agents with a gold glint sold especially by ENGELHARD under the name Sunstone G012 (Gemtone); pink nacres sold especially by ENGELHARD under the name Tan opal G005 (Gemtone); the black nacres with gold reflection sold by the company Engelhard under the name Nu antique bronze 240 AB (Timica), the blue nacres sold especially by the company Merck under the name Matte Blue (17433) (Microna), the white nacres with reflection silver sold in particular by the company MERCK under the name Xirona Silver and the golden-green orange-colored mother-of-pearl marketed by Merck under the name Indian summer (Xirona) and their mixtures.  Multilayer interference pigments having magnetic properties are, for example, those marketed under the trade names COLORONA 25 BLACKSTAR BLUE, COLORONA BLACKSTAR GREEN, COLORONA BLACKSTAR GOLD, COLORONA BLACKSTAR RED, CLOISONNE NU ANTIQUE SUPER GREEN, MICRONA MATTE BLACK (17437), MICA BLACK ( 17260), COLORONA PATINA SILVER (17289) and COLORONA PATINA GOLD (117288) from MERCK or FLAMENCO TWILIGHT RED, FLAMENCO 25 30 TWILIGHT GREEN, FLAMENCO TWILIGHT GOLD, FLAMENCO TWILIGHT BLUE, TIMICA NU ANTIQUE SILVER 110 AB, TIMICA NU ANTIQUE GOLD 212 GB, TIMICA NU-ANTIQUE COPPER 340 AB, TIMICA NU ANTIQUE BRONZE 240 2908632 10 AB, CLOISONNE NU ANTIQUE GREEN 828 CB, CLOISONNE NU ANTIQUE BLUE 626 CB, GEMTONE MOONSTONE G 004, ANTIQUE CLOISONNE NU RED 424 CB, CHROMA- LITE BLACK (4498), NARROW RED ANTIQUE CLOISONNE FLAMBE (code 440 XB), ANCIENT BRONZE NARROW CLOISONNE (240 XB), CLOISONNE NU 5 ANTIQUE GOLD (222 CB) and ANTIQUE CLOISONNE COPPER (34 0 XB) from ENGELHARD.  The multilayer interference pigment may also be chosen from interferential reflective particles.  These particles may be chosen from particles with a synthetic substrate at least partially coated with at least one layer of at least one metal oxide, chosen, for example, from titanium oxides, in particular TiO 2, in particular Fe 2 O 3, of tin, chromium, barium sulfate and the following materials: MgF 2, CrF 3, ZnS, ZnSe, SiO 2, Al 2 O 3, MgO, Y 2 O 3, SeO 3, SiO, HfO 2, ZrO 2, CeO 2, Nb 2 O 5, Ta 2 O 5, MoS 2 and their mixtures or alloys.  By way of example of such particles, mention may be made, for example, of particles comprising a synthetic mica substrate coated with titanium dioxide, or particles of coated glass of brown iron oxide, of titanium oxide, of tin oxide or one of their mixtures such as those sold under the trade name REFLECKS by ENGELHARD.  The multilayer interference pigment may be a goniochromatic pigment.  Goniochromatic Pigment For the purposes of the present invention, the term "goniochromatic pigment" denotes a pigment which makes it possible, when the composition is spread on a support, to obtain a color path in the plane a * b * of the CIE 1976 color space. corresponds to a variation Dh of the hue angle h of at least 20 when the observation angle is varied with respect to the normal between 0 and 80, for an angle of incidence of the light of 45.  The color path can be measured for example by means of an INSTRUMENT SYSTEMS spectrogoniorflectometer and GON 360 GONIOMETER reference, after the composition has been spread in a fluid state with a thickness of 300 m by means of an automatic spreader on a ERICHSEN brand contrast card and Typ 24/5 reference, the measurement being made on the black background of the card.  The goniochromatic pigment may be chosen for example from interferential multilayer structures and liquid crystal coloring agents.  In the case of a multilayer structure, this may comprise for example at least two layers, each layer being made for example from at least one material selected from the group consisting of the following materials: MgF 2, CeF 3, ZnS, ZnSe, Si, SiO2, Ge, Te, Fe2O3, Pt, Va, Al2O3, MgO, Y2O3, S2O3, SiO, HfO2, ZrO2, CeO2, Nb2O5, Ta2O5, TiO2, Ag, Al, Au, Cu, Rb, Ti, Ta, W, Zn, MoSz, cryolite, alloys, polymers and their combinations.  The multilayer structure may or may not have symmetry with respect to a central layer at the chemical nature of the stacked layers.  Depending on the thickness and nature of the different layers, different effects are obtained.  Examples of symmetrical multilayer interference structures are, for example, the following structures: Fe 2 O 3 / SiO 2 / Fe 2 O 3 / SiO 2 / Fe 2 O 3, a pigment having this structure being marketed under the name SICOPEARL by the company BASF; MoS2 / SiO2 / mica-oxide / SiO2 / MoS2; Fe2O3 / SiO2 / mica-oxide / SiO2 / Fe2O3; TiO2 / SiO2 / TiO2 and TiO2 / Al2O3 / TiO2, pigments having these structures being marketed under the name XIRONA by the company Merck (Darmstadt).  The liquid crystal coloring agents include, for example, silicones or cellulose ethers onto which mesomorphic groups are grafted.  Examples of goniochromatic liquid crystal particles that may be used are those sold by the company Chenix and those sold under the name HELICONE HC by the company Wacker.  As the goniochromatic pigment, it is also possible to use certain nacres, pigments with effects on a synthetic substrate, in particular substrate such as alumina, silica, borosilicate, iron oxide, aluminum, or interfering flakes from a polyterephthalate film.  The material may further comprise dispersed goniochromatic fibers.  Such fibers may have a length of less than 80 m for example.  Cosmetically acceptable medium Physiologically acceptable medium means a non-toxic medium that can be applied to the skin or the lips of human beings.  The cosmetically acceptable medium is generally adapted to the nature of the support to which the composition is to be applied and to the appearance under which the composition is intended to be packaged, stick-shaped or cast or compacted in a cup.  Paste compound The medium may comprise a pasty compound chosen, for example, from: - silicone compounds, whether or not they are polymeric, - fluorinated compounds that are polymeric or otherwise, - vinyl polymers, in particular: - homopolymers of olefins - copolymers of olefins homopolymers and copolymers of hydrogenated dienes linear or branched oligomers, homo or copolymers of alkyl (meth) acrylates preferably having a C 6 -C 30 alkyl group; homo and copolymer oligomers of vinyl esters having alkyl groups; C 8 -C 30 homo- and copolymers of vinyl ethers having C 8 -C 30 alkyl groups; liposoluble polyethers resulting from the polyetherification between one or more C 2 -C 100 diols, preferably C 2 -C 50 diols; , And their mixtures.  The pasty compound is preferably a polymer, in particular a hydrocarbon polymer.  Silicone and / or Fluorinated Paste Compounds An example of a silicone and fluoro pasty compound is polymethyl trifluoropropyl methylalkyl dimethylsiloxane, manufactured under the name X22-1088 by the company Shin Etsu.  When the pasty compound is a silicone and / or fluorinated polymer, the composition advantageously comprises a compatibilizing agent such as short-chain esters such as isodecyl neopentanoate.  Polyether Paste Compounds Among the liposoluble polyethers, ethylene-oxide and / or propylene oxide copolymers with C6-C30 long-chain alkylene oxides are particularly preferred, such as the weight ratio of ethylene oxide and / or propylene oxide with alkylene oxide in the copolymer is from 5:95 to 70:30.  In this family, mention will in particular be made of copolymers such as long-chain alkylene oxides are arranged in blocks having an average molecular weight of 1. 000 to 10. 000, e.g. a polyoxyethylene / polydodecyl glycol block copolymer such as dodecanediol (22 mol) and polyethylene glycol (45 EO) ethers marketed under the tradename ELFACOS ST9 by Akzo Nobel.  Of the esters, the esters of an oligomeric glycerol, in particular the diglycerol esters, in particular the adipic acid and glycerol condensates, for which part of the hydroxyl groups of the glycerols have reacted with a mixture of fatty acids such as stearic acid, capric acid, stearic acid and isostearic acid and 12-hydroxystearic acid, such as those marketed under the trademark Softisan 649 by the company Sasol, Arachidyl propionate sold under the name Waxenol 801 by Alzo; phytosterol esters; non-crosslinked polyesters resulting from the polycondensation between a linear or branched C 4 -C 50 diacid or polycarboxylic acid and a diol or a diol. C2-C30 polyol; aliphatic ester esters resulting from the esterification of an aliphatic hydroxycarboxylic acid ester with an aliphatic carboxylic acid; and their mixtures.  The aliphatic carboxylic acid comprises from 4 to 30 and preferably from 8 to 30 carbon atoms.  It is preferably selected from hexanoic acid, heptanoic acid, octanoic acid, 2-ethyl hexanoic acid, nonanoic acid, decanoic acid, undecanoic acid, dodecanoic acid, acid tridecanoic acid, tetradecanoic acid, pentadecanoic acid, hexadecanoic acid, hexydecanoic acid, heptadecanoic acid, octadecanoic acid, isostearic acid, nonadecanoic acid, eicosanoic acid, isoarachidic acid, octyldodecanoic acid, henicosanoic acid, docosanoic acid, and mixtures thereof.  The aliphatic carboxylic acid is preferably branched.  The ester of aliphatic hydroxy carboxylic acid is advantageously derived from a hydroxylated aliphatic carboxylic acid having from 2 to 40 carbon atoms, preferably from 10 to 34 carbon atoms and more preferably from 12 to 28 carbon atoms, and from 1 to to 20 hydroxyl groups, preferably 1 to 10 hydroxyl groups and more preferably 1 to 6 hydroxyl groups.  The aliphatic hydroxycarboxylic acid ester is selected from: a) partial or total esters of linear, saturated monohydroxylated aliphatic monocarboxylic acids; b) partial or total esters of unsaturated monohydroxylated aliphatic monocarboxylic acids; c) partial or total esters of saturated monohydroxylated aliphatic polycarboxylic acids; d) partial or total esters of saturated polyhydroxylated aliphatic polycarboxylic acids; e) partial or total esters of C2 to C16 aliphatic polyols reacted with mono or polyhydroxylated aliphatic mono or poly carboxylic acid, and mixtures thereof.  The aliphatic ester esters are advantageously chosen from: the ester resulting from the esterification reaction of hydrogenated castor oil with isostearic acid in proportions of 1 to 1 (1/1) or oil monoisostearate hydrogenated castor, the ester resulting from the esterification reaction of hydrogenated castor oil with isostearic acid in proportions 1 to 2 (1/2) or hydrogenated castor oil diisostearate, 2908632 the ester resulting from the esterification reaction of hydrogenated castor oil with isostearic acid in proportions of 1 to 3 (1/3) or hydrogenated castor oil triisostearate, and mixtures thereof.  Among the pasty compounds of plant origin, a mixture of soy sterols and oxyethylenated (5OE) oxypropylene pentaerythritol (5 PO), marketed under the reference Lanolide by the company VEVY, will preferably be chosen.  The pasty compound is preferably 1 to 99%, more preferably 1 to 60%, more preferably 2 to 30% and most preferably 5 to 15% by weight of each solid product composition.  In particular, a pasty compound and an ester as defined above can be combined in the cosmetic composition in a pasty / ester compound weight ratio ranging from 0.25 to 0.75, especially from 0.3 to 0.6.  The cosmetic composition according to the invention may have a continuous fat phase, which may contain less than 5% water, especially less than 1% water relative to its total weight.  Fatty phase Each composition, especially when the product is intended to be applied to the lips, may comprise at least one fatty phase and in particular at least one fatty substance that is liquid at room temperature (25 ° C.) and at atmospheric pressure and / or a body. solid fat at room temperature and at atmospheric pressure such as waxes, gums and mixtures thereof.  The fatty phase may further contain gelling and structuring agents of organic oils and / or lipophilic organic solvents.  The fatty phase of the composition according to the invention may comprise, as liquid fatty substance, at least one volatile or non-volatile oil or a mixture thereof.  For the purposes of the invention, the term "volatile oil" means any oil capable of evaporating on contact with the skin in less than one hour at ambient temperature and atmospheric pressure.  The volatile oils of the invention are volatile cosmetic oils, liquid at room temperature, having a non-zero vapor pressure, at ambient temperature and atmospheric pressure, in particular from 0.01 to 300 mmHg (1.33 Pa to 40. 000 Pa) and preferably greater than 0.3 mmHg (30 Pa).  By "non-volatile oil" is meant an oil remaining on the skin at room temperature and atmospheric pressure for at least several hours and having in particular a vapor pressure of less than 0.01 mmHg (1.33 Pa).  These volatile or non-volatile oils may be hydrocarbon oils, in particular of animal or vegetable origin, silicone oils, or mixtures thereof.  The term "hydrocarbon-based oil" means an oil containing mainly hydrogen and carbon atoms and optionally oxygen, nitrogen, sulfur and / or phosphorus atoms.  The volatile hydrocarbon oils may be chosen from hydrocarbon oils having from 8 to 16 carbon atoms, and in particular C8-C16 branched alkanes such as C8-C16 isoalkanes of petroleum origin (also known as isoparaffins), such as isododecane. (also called 2,2,4,4,6-pentamethylheptane), isodecane, isohexadecane, and for example the oils sold under the trade names Isopars or permetyls, C8-C16 branched esters such as isohexyl neopentanoate, and mixtures thereof.  Other volatile hydrocarbon oils such as petroleum distillates, especially those sold under the name Shell Solt by Shell, can also be used.  Volatile silicones, such as, for example, volatile linear or cyclic silicone oils, especially those having an 8-centistokes viscosity (8 × 10 -6 m 2 / s), and especially from 2 to 7, can also be used as volatile oils. silicon atoms, these silicones optionally having alkyl or alkoxy groups having from 1 to 10 carbon atoms.  As volatile silicone oil that can be used in the invention, mention may be made in particular of octamethylcyclotetrasiloxane, decamethylcyclopentasiloxane, dodecamethylcyclohexasiloxane, heptamethylhexyltrisiloxane, heptamethyloctyltrisiloxane, hexamethylisiloxane, octamethyltrisiloxane, decamethyl tetrasiloxane, dodecamethyl pentasiloxane and mixtures thereof.  The volatile oil may be present in the composition according to the invention at a content ranging from 0.1% to 98% by weight, especially from 1% to 65% by weight, and in particular from 2% to 50% by weight. , relative to the total weight of the composition.  The non-volatile oils may in particular be chosen from fluorinated hydrocarbon oils which may be fluorinated and / or non-volatile silicone oils.  Non-volatile hydrocarbon oils that may especially be mentioned include: hydrocarbon oils of animal origin; hydrocarbon oils of vegetable origin, such as triglycerides consisting of esters of fatty acids and of glycerol, the fatty acids of which may have various chain lengths of C4 to C24, the latter being linear or branched, saturated or unsaturated; these oils include wheat germ, sunflower, grape seed, sesame, maize, apricot, castor, shea, avocado, olive, soya, sweet almond oil , palm, rapeseed, cotton, hazelnut, macadamia, jojoba, alfalfa, poppy, pumpkin, sesame, pumpkin, rapeseed, blackcurrant, evening primrose, millet, barley , quinoa, rye, safflower, bancoulier, passionflower, muscat rose; shea butter; or alternatively caprylic / capric acid triglycerides, such as those sold by Stéarineries Dubois or those sold under the names Miglyol 810, 812 and 818 by the company Dynamit Nobel, synthetic ethers having from 10 to 40 carbon atoms; linear or branched hydrocarbons of mineral or synthetic origin, such as petroleum jelly, polydecenes, hydrogenated polyisobutene such as parleam, squalane and their mixtures; synthetic esters, such as the oils of formula R1000R2 in which R1 represents the residue of a linear or branched fatty acid having from 1 to 40 carbon atoms and R 2 represents a particularly branched hydrocarbon-based chain containing from 1 to 40 carbon atoms, provided that R 1 + R 2 is 10, such as for example Purcellin oil (cetostearyl octanoate), isopropyl myristate, isopropyl palmitate, C12-C15 alcohol benzoates, hexyl laurate, diisopropyl adipate, isononyl isononanoate, 2-ethylhexyl palmitate, isostearyl isostearate, heptanoates, octanoates, decanoates or ricinoleates of alcohols or polyalcohols such as propylene glycol dioctanoate; hydroxylated esters such as isostearyl lactate, diisostearyl malate; polyol esters and pentaerythritol esters, branched-chain and / or unsaturated carbon-chain liquid fatty alcohols having from 12 to 26 carbon atoms, such as octyl dodecanol, isostearyl alcohol and oleic alcohol, 2-hexyldecanol, 2-butyloctanol and 2undecylpentadecanol; higher fatty acids such as oleic acid, linoleic acid, linolenic acid and mixtures thereof.  The non-volatile silicone oils that may be used in a composition of a product according to the invention may be non-volatile polydimethylsiloxanes (PDMS), polydimethylsiloxanes comprising pendant alkyl or alkoxy groups and / or silicone chain ends, groups having each of 2 to 24 carbon atoms, phenyl silicones such as phenyl trimethicones, phenyl dimethicones, phenyl trimethylsiloxy diphenylsiloxanes, diphenyl dimethicones, diphenyl methyldiphenyl trisiloxanes, and 2-phenylethyl trimethylsiloxysilicates and mixtures thereof.  The non-volatile oils may be present in a composition of a product according to the invention in a content ranging from 0.01 to 90% by weight, especially from 0.1% to 85% by weight, and in particular from 1 to 100% by weight. % to 70% by weight, relative to the total weight of the composition.  The oils may represent from 0 to 99% of the total weight of each composition, preferably from 0.05 to 60% and better still from 1 to 35%.  The oils can be of molecular weight between 650 and 10. 000 g / mol, preferably between 750 and 7. 500 g / mol.  According to one embodiment, each composition comprises an oily phase comprising at least 70% by weight of an oil with a molar mass of between 650 and 10. 000 g / mol, preferably between 750 and 7. 500 g / mol.  The oily phase advantageously comprises more than 80%, preferably more than 85% by weight of an oil of molar mass of between 650 and 10. 000 g / mol, preferably between 750 and 7. 500 g / mol.  The high molecular weight oil may be chosen from lipophilic polymers: linear fatty acid esters having a total number of carbons ranging from 35 to 70; hydroxylated esters; aromatic esters; fatty alcohol or branched C24-C28 fatty acids, silicone oils, vegetable oils, and mixtures thereof.  The high molecular weight oil may be selected from polybutylenes, hydrogenated polyisobutylenes, polydecenes, hydrogenated polydecenes, copolymers of vinylpyrrolidone such as PVP / hexadecene copolymer, pentaerythrityl tetrapelargonate, polyglycerol triisostearate, and the like. 2, tridecyl trimellitate, triisoarachidyl citrate, pentaerythrityl tetraisonanoate, glyceryl triisostearate, pentaerythrityl tetraisostearate, glyceryl 2,5-tri-tetradecanoate, pentaerythritol tetra decyl-2 tetradecanoate, phenyl silicones, sesame oil, and mixtures thereof.  Each composition may also comprise a fatty substance which is solid at ambient temperature and at atmospheric pressure, chosen, for example, from waxes, gums and their mixtures.  This solid fatty substance may be present in a proportion of from 0.01 to 50%, in particular from 0.1 to 40% and in particular from 0.2 to 30% by weight, relative to the total weight of the fatty phase.  Waxes and Erasers Each composition may contain at least one wax.  By "wax" is meant a lipophilic fat compound, solid at room temperature (25 ° C.), with a reversible solid / liquid state change, having a melting temperature greater than 30 ° C. and up to 200 ° C. hardness greater than 0.5 MPa, and having in the solid state an anisotropic crystalline organization.  By bringing the wax to its melting temperature, it is possible to render it miscible with oils and to form a homogeneous mixture microscopically, but by bringing the temperature of the mixture to room temperature, a recrystallization of the wax in the oils is obtained. of the mixture.  The waxes that can be used are solid compounds at room temperature, intended to structure the composition, in particular in the form of a stick; they may be hydrocarbon-based, fluorinated and / or silicone-based and may be of vegetable, mineral, animal and / or synthetic origin.  In particular, they have a melting temperature greater than 40 ° C. and better still greater than 45 ° C.  As a usable wax, mention may be made of those generally used in the cosmetics field: they are in particular of natural origin, such as beeswax, carnauba wax, candelilla wax, ouricoury wax, Japan wax, cork fiber wax or sugar cane, rice, montan, paraffin, lignite or microcrystalline waxes, ceresin or ozokerite, hydrogenated oils such as jojoba oil; synthetic waxes such as polyethylene waxes resulting from the polymerization or copolymerization of ethylene and Fischer-Tropsch waxes or fatty acid esters such as octacosanyl 2908632 stearate, glycerides concretes at 40 C and better to 45 C, silicone waxes such as alkyl or alkoxydimethicones having an alkyl or alkoxy chain of 10 to 45 carbon atoms, esters of poly (di) methylsiloxane solid at 40 C whose ester chain comprises at least 10 carbon atoms ; and their mixtures.  The gums which can be used in the invention are generally in oil-solubilized form, the polymers are solid at room temperature and the resins can be liquid or solid at room temperature.  By gum is meant a fatty substance which is in the form of a solid polymer at room temperature having a weight average molecular weight of 50,000 to 1,000,000.  The gum is often sold in dispersion in an organic solvent, of the silicone oil type.  The nature and quantity of the gums or waxes depend on the mechanical properties and textures sought.  As an indication, the wax may represent from 0.01 to 50%, preferably from 2 to 40%, and better still from 5 to 30% of the total weight of each composition of the product.  In particular, the wax may be present in the form of wax emulsion (s) in water.  The wax may be present in each composition in a content ranging from 0.01% to 50% by weight, in particular from 0.1% to 30% by weight, and in particular from 0.2% to 20% by weight, relative to the total weight of the composition.  Other Coloring Agents One or more compositions of the solid product may contain other coloring agents than the multilayer interference pigment (s).  At least one of the compositions may comprise one or more diffusing pigments, generating a color by an absorption phenomenon, in a proportion that makes it possible to retain the interference phenomenon responsible for the color of the composition once applied to the materials. keratin.  Various diffusing pigments may be envisaged, for example chosen from among the organic lakes or pigments selected in particular from the materials below and their mixtures: cochineal carmine, organic pigments of azo, anthraquinone, indigo, xanthene dyes, pyrenic, quinolinic, triphenylmethane, fluorane, 2908632 21 - organic lakes or insoluble salts of sodium, potassium, calcium, barium, aluminum, zirconium, strontium, titanium, acid dyes such as azo, anthraquinone, indigo, xanthene, pyrenic, quinoline, triphenylmethane and fluoran dyes, which dyes may contain at least one carboxylic or sulfonic acid group.  Among the organic pigments, there may be mentioned those known under the following denominations: D & C Blue No. 4, D & C Brown No. 1, D & C Green No. 5, D & C Green No. 6, D & C Orange No. 4, D & C Orange No. 5, D & C Orange No. 10 , D & C Orange # 11, D & C Red # 6, D & C Red # 7, D & C Red # 17, D & C Red # 21, D & C Red # 22, 10 D & C Red # 27, D & C Red # 28, D & C Red # 30, D & C Red n 31, D & C Red No. 33, D & C Red No. 34, D & C Red No. 36, D & C Violet No. 2, D & C Yellow No. 7, D & C Yellow No. 8, D & C Yellow No. 10, D & C Yellow No. 11, FD & C Blue No. 1, FD & C Green No. 3, FD & C Red No. 40, FD & C Yellow No. 5, FD & C Yellow No. 6.  The lacquer may be supported by an organic carrier such as rosin or aluminum benzoate, for example.  Among the organic lakes, mention may be made in particular of those known under the following names: D & C Red n 2 Aluminum lake, D & C Red n 3 Aluminum lake, D & C Red n 4 Aluminum lake, D & C Red n 6 Aluminum lake, D & C Red n 6 Barium Lake, D & C Red # 6 Barium / Strontium Lake, D & C Red # 6 Strontium Lake, D & C 20 Red # 6 Potassium Lake, D & C Red # 7 Aluminum Lake, D & C Red # 7 Barium Lake, D & C Red # 7 Calcium Lake, D & C Red 7 Calcium / Strontium lake, D & C Red n 7 Zirconium lake, D & C Red 8 Sodium lake, D & C Red 9 Aluminum lake, D & C Red 9 Barium lake, D & C Red 9 Barium / Strontium lake, D & C Red 9 Zirconium lake, D & C Red # 10 Sodium lake, D & C Red # 19 Aluminum lake, D & C Red # 19 Barium 25 lake, D & C Red # 19 Zirconium lake, D & C Red # 21 Aluminum lake, D & C Red # 21 Zirconium lake, D & C Red # 22 Aluminum lake, D & C Red n 27 Aluminum lake, D & C Red n 27 Aluminum / Titanium / Zirconium lake, D & C Red n 27 Barium lake, D & C Red n 27 Calcium lake, D & C Red n 27 Zir conium lake, D & C Red n 28 Aluminum lake, D & C Red n 30 lake, D & C Red n 31 Calcium lake, D & C Red n 33 Aluminum lake, 30 D & C Red 34 Calcium lake, D & C Red 36 lake, D & C Red n 40 Aluminum lake , D & C Blue n 1 Aluminum lake, D & C Green n 3 Aluminum lake, D & C Orange n 4 Aluminum lake, D & C Orange n 5 Aluminum lake, D & C Orange n 5 Zirconium lake, 2908632 22 D & C Orange n 10 Aluminum lake, D & C Orange n 17 Barium Lake, D & C Yellow # 5 Aluminum Lake, D & C Yellow # 5 Zirconium Lake, D & C Yellow # 6 Aluminum Lake, D & C Yellow # 7 Zirconium Lake, D & C Yellow # 10 Aluminum Lake, FD & C Blue # 1 Aluminum Lake, FD & C Red # 4 Aluminum Lake , FD & C Red No. 40 Aluminum Lake, 5 FD & C Yellow No. 5 Aluminum Lake, FD & C Yellow No. 6 Aluminum Lake.  The chemical materials corresponding to each of the organic dyestuffs mentioned above are mentioned in the International Cosmetic Ingredient Dictionary and Handbook, Edition 1997, pages 371 to 386 and 524 to 528, published by The Cosmetic, Toiletry, and Fragrance Association, whose Content is incorporated herein by reference.  The diffusing pigment may be a composite pigment having a core at least partially coated with a bark.  Such a composite pigment may be composed in particular of particles comprising an inorganic core and at least one at least partial coating of at least one organic dyestuff.  At least one binder may advantageously contribute to the attachment of the organic dyestuff to the inorganic core.  The composite pigment particles may have various shapes.  These particles may in particular be platelet-shaped or globular, in particular spherical, and may be hollow or solid.  Platelet-shaped means particles whose ratio of the largest dimension to the thickness is greater than or equal to 5.  A composite pigment may have, for example, a specific surface area of between 1 and 1000 m 2 / g, in particular between 10 and 600 m 2 / g

  approximately, and in particular between 20 and 400 m2 / g approximately. The specific surface is the value measured by the BET method. The mass proportion of the core may exceed 50% based on the total weight of the composite pigment, for example from 50% to 70%, for example from 60% to 70%. The coloring agent may still be a dye. It may be a dye of plant, animal or mineral origin, in particular of vegetable or mineral origin, in particular of plant origin. This dye may be of a non-synthetic nature.

The dye may be a water-soluble or fat-soluble natural dye. As an illustration of the natural water-soluble coloring agents that can be used according to the invention, mention may be made especially of caramel, beetroot juice and carmine, betanin (beet), copper chlorophyllin, blue methylene, anthocyanins (enocianin, black carrot, hibiscus, elderberry) and riboflavin. As an illustration of the fat-soluble natural coloring agents that can be used according to the invention, mention may be made especially of Sudan red, β-carotene, carotenoids, lycopene, palm oil, Sudan brown, quinolinic yellow xanthophylls (capsanthin, capsorubine, lutein), and curcumin. Other natural dyes that may be mentioned more particularly are anthocyanins of flowers or fruits or their derivatives, flavonoids and tannins extracted from native or fermented plants, juglone, lawsone, extracts of fermented soybean, seaweed, 10 fungi, microorganisms, unsubstituted Flavylium salts in position 3 as described in patent EP 1 172 091, extracts of Gesneria Fulgens, Blechum Procerum, Saxifraga and pigments obtainable by extraction by a solvent organic or hydro-organic culture medium micromycetes monascus monascus type.

As examples of synthetic dyes, mention may be made of synthetic fat-soluble dyes such as, for example, DC Red 17, DC Red 21, DC Red 27, DC Green 6, DC Yellow 11, DC Violet 2 and Orange DC 5. Examples of synthetic water-soluble dyes that may be mentioned include FDC Red 4, DC Red 6, DC Red 22, DC Red 28, DC Red 30, DC Red 33, DC 20 Orange 4. , DC Yellow 5, DC Yellow 6, DC Yellow 8, FDC Green 3, DC Green 5 and FDC Blue 1. Charges and Assets For the purposes of the invention, the term refers to any compound, organic and / or inorganic introduced into a cosmetic composition to adjust its properties in terms of texture or in other words to control its rheological properties. Pigments are notably excluded from this definition. Each composition comprises, for example, less than 15% by weight, in particular less than 10% by weight, especially less than 7% by weight of filler relative to the total weight of the composition.

It may for example be for example talc, zinc stearate, mica, kaolin, polyamide (nylon) powders (Orgasol from Atochem), polyethylene powders, tetrafluoroethylene polymer powders (Teflon). ), starch, boron nitride, polymeric microspheres such as those of polyvinylidene chloride / acrylonitrile such as Expancel (Nobel Industrie), copolymers of acrylic acid (Polytrap Dow Corning), silicone resin microbeads (Toshiba Tospearls, for example), and organopolysiloxane elastomers.

As cosmetic active agents that may be used in the invention, mention may be made of vitamins A, E, C, B3, provitamines such as D-panthenol, soothing active agents such as a-bisabolol, aloe vera, allantoin, plant extracts or essential oils, protective or restructuring agents such as ceramides, freshness active ingredients such as menthol and its derivatives, emollients (cocoa butter, dimethicone), moisturizers (arginine PCA), anti-wrinkle active agents, essential fatty acids, and mixtures thereof. Those skilled in the art will take care to choose this or these optional additional compounds, and / or their quantity, in such a way that the desired properties of each composition are not, or not substantially, impaired by the addition considered.

Preparation Each composition can be obtained according to the preparation methods conventionally used in cosmetics or in dermatology. The product may be in an extruded, compacted or stick-cast form. The product compositions can be coextruded. The product may constitute, among other makeup products, a product to be applied to the lips, for example a lip gloss, a lipstick, a lip balm, a blush, a foundation, a contour product eyes, eyeliner, eye shadow, makeup base, body make-up product or hair. Packaging and modes of application FIG. 1 shows a stick S which has two blocks A and B extending over the entire length of the stick.

Each block A or B occupies for example half of the stick and these two blocks are for example contiguous according to the diameter of the stick.

The stick S may be packaged in a packaging and dispensing device comprising, for example, a body C in which the stick is at least partially received, as illustrated in FIG. 2, and a drive mechanism M making it possible to displace the stick. stick relative to the body C.

The packaging and dispensing device can be of any type suitable for packaging a stick and the drive mechanism M comprises for example a rotating wheel in the lower part. The two blocks A and B may be of the same proportion or not within the stick. One block may be surrounded by the other block, as shown in Figure 3.

The two blocks A and B may each have a color difference ΔE between the color within the stick and the color after application to the keratin materials. Only one of the blocks A or B can have this characteristic, the other block not presenting for example this property. The two blocks A and B may or may not have substantially the same color within the stick, for example the white color. The stick may comprise, if necessary, more than two blocks, for example three blocks as shown in Figure 4. The third block E may or may not have a color difference between the color within the stick, in the mass, and the color after application on keratin materials.

The stick may be produced by coextrusion, casting or compaction of the compositions intended to form the different blocks. In the example of Figure 5, the product comprises two blocks A and B cast or compacted in a cup. In a non-illustrated variant, the composition blocks are contained in a sheath so as to form a pencil. Each block A or B may have a constant cross section over the entire width of the product. Alternatively, at least one of the blocks may have a variable cross section along the length of the product. One of the blocks may have a circular cross section.

A block may have, in longitudinal section, a bevelled shape widening towards one longitudinal end while the other block also has a beveled shape, widening in the opposite direction, as illustrated in longitudinal section at According to another of its aspects, a subject of the invention is also a process for the presentation of a cosmetic composition produced in accordance with the invention, comprising the steps of: minus a first region of a composition sample with diffuse illumination so as to bring out the color in the mass, - illuminate at least a second region of a composition sample with directional illumination so as to reveal the interferential color . The product can be illuminated so as to simultaneously show all the colors of the compositions after application. The first and second regions may be different regions of the same composition sample. Alternatively, the first and second regions belong to different samples. In another variant, the first and second regions correspond to the same region and the diffuse and directional lighting are applied alternately.

The invention further relates, in another of its aspects, to a display comprising: a directional lighting source, a diffuse lighting source, a support for exposing at least one sample of composition the diffuse lighting source and at least one composition sample at the directional lighting source. The invention also relates to a process for making up keratin materials using a product according to the invention. It can be makeup of the skin, lips or hair.

The make-up may for example be carried out without mixing the compositions on application. For example, a stick can be displaced by a translational movement so as to create two colored traces having different colors and each corresponding to the deposition of the composition of one of the blocks. The application can also be carried out so as to cause a mixture or superposition of the compositions of the blocks during the application. In a variant where the blocks of composition are contained in a cup, each of the compositions is for example taken by means of an applicator or the finger.

Proposed Example The contents indicated are by weight. Example 1 Lipstick First composition Tri-decyl tri-mellitate Liquid lanolin Iso-stearyl malate Acetyl lanolin Triglycerides of lauric / palmitic / cetyl / stearic acids (50/20/10) 10) Microcrystalline wax (C20-C60) 3 Protected isopropyl lanolate 9 Octyl-2-decanol Phenyl trimethylsiloxy trisiloxane (VISCOSITY: 20 CST - MW: 372) 4 Polyethylene wax (MW: 500) 8 Multilayered interferential pigment * 10 Pigment with metallic reflection * * 3 * TIMIRON SILK RED from MERCK ** METASHINE ME 2040 PS from NIPPON SHEET GLASS 2908632 Second composition Tri-mellitate tri-decylate 11 Liquid lanolin 10 Isostearyl malate 12 Lanolin acetylated 10 Triglycerides of lauric / palmitic / cetyl / stearic acids 5 (50/20/10/10) Microcrystalline wax (C20-C60) 3 Protected isopropyl lanolate 9 Octyl-2-decanol Phenyl trimethylsiloxy trisiloxane (VISCOSITY: 20 CST - PM: 372) 4 Polyethylene wax (MW: 500) 8 P multilayer interferential pigment * 10 Metal reflection pigment * * 3 * TIMIRON SILK BLUE from MERCK ** METASHINE ME 2040 PS from NIPPON SHEET GLASS The two compositions are coextruded to form two blocks producing different colors in the application. . The first composition, red, occupies for example the center of the stick and the second composition, blue, its periphery, the two blocks being concentric. Violet may appear at the application, in the center, delimited by blue borders.

Of course, the invention is not limited to the example just given. The expression containing one is synonymous with having at least one and understood between understood inclusive limits. 28

Claims (26)

  1. A solid cosmetic product, in particular a stick, comprising at least: a first block of a first cosmetic composition containing, in a cosmetically acceptable medium, at least a first multilayer interference pigment, a second block of a second composition cosmetic, containing in a cosmetically acceptable medium, at least one second multilayer interference pigment different from the first, at least one of the first and second compositions being capable of having a first color in the mass and a second color after application to materials. keratinous, the first and second colors differing by a difference AE greater than or equal to 2, better 5.   2. Product according to claim 1, each of the first and second compositions being capable of presenting a first color within the product and a second color after application to keratinous materials, the first and second colors of each composition differing from a gap. AE greater than or equal to 5.   3. Product according to claim 1 or 2, the first (A) and second (B) blocks extending over the entire length of the product (S).   4. The product of claim 3, wherein each block (A) or (B) has a constant cross-section over the entire width of the product.   5. Product according to claim 3, at least one of the blocks having a cross section variable along the length of the product.   6. Product according to claim 1 or 2, the first (A) and second (B) blocks being concentric. 25   7. Product according to any one of claims 1 to 5, one of the blocks having a circular cross section.   8. Product according to claim 5, the cross section of a block passing from a maximum cross section to a longitudinal end of the product at a minimum cross section at the opposite longitudinal end. 30   9. Product according to any one of claims 1 to 4, at least one of the first and second compositions being anhydrous. 2908632 30   10. Product according to any one of claims 1 to 4, at least one of the first and second compositions being aqueous.   11. Product according to any one of claims 1 to 6, the total mass content of multilayer interference pigment in at least one of the first and second compositions ranging from 7 to 20%.   12. The product of claim 7, the content ranging from 8 to 15%.   13. Product according to any one of claims 1 to 8, the color of at least one of the compositions in the mass being white.   14. The product of claim 9, wherein the bulk composition has a brightness index greater than or equal to 40.   15. Product according to any one of claims 1 to 10, at least one of the compositions having no other coloring agent than the multilayer interference pigment or pigments.   16. A product according to any one of claims 1 to 11, the multilayer interference pigment of at least one of compositions comprising at least four layers.   17. Product according to any one of claims 1 to 12, the multilayer interference pigment at least one of compositions comprising a substrate of a transparent material. 20   18. Product according to any one of claims 1 to 13, the multilayer interference pigment of at least one composition comprising a substrate of silica, glass mica, alumina or metal.   19. A product according to any one of claims 1 to 14, at least one of the first and second compositions having only one multilayer interference pigment.   20. Product according to any one of claims 1 to 14, at least one of the compositions comprising at least two multilayer interference pigments.   21. The product according to claim 16, wherein the two multilayer interference pigments have layers consisting of the same materials but at least one layer of a pigment having a thickness different from a corresponding layer of the other pigment. 2908632 31   22. Product according to any one of claims 17 to 17, the compositions having two respective multilayer interference pigments having layers consisting of the same materials, at least one layer of a pigment having a thickness different from a corresponding layer of the other pigment, so as to produce different colors.   23. A process for making up keratin materials, comprising applying to the keratin materials at least the first and second compositions of a product according to any one of claims 1 to 18.   24. The method of claim 19, the first and second compositions being applied simultaneously.   25. The method of claim 20, the compositions being applied so as to create traces of different colors.   26. A packaging and dispensing device comprising: - a product as defined in any one of claims 1 to 21, 15 - a hollow body in which the product is housed at least partially. 28. Device according to claim 22, comprising a drive mechanism for moving the composition relative to the body. 29. Packaging assembly comprising: a product as defined above in any one of claims 1 to 22; means for informing the user about the color of at least one of the compositions of the product; after application, or even a color formed by superposition of the compositions to the application.